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    <!-- 倒序遍历输出数组 -->
    <script>
        var arr = [1, 2, 3, 4, 5 , 6 , 7];
        var str = [];
        for(var i = arr.length - 1; i >= 0; i--){
            str.push(arr[i]);
            }
            console.log(str);
            
    </script>
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